32results about How to "Avoid motor damage" patented technology

The present invention discloses layered sewage treatment equipment which comprises a pretreatment box, a purification box, a water storage tank, a lifting pump box, an isolation screen plate, a first motor, a knife rest, a dragon shaft, a spiral conveying blade, a water pressure sensor, an impeller, a second motor, a lifting pipe, a filter box, a controller, a base, an ozone generator and an arc-shaped scraper. The arc-shaped scraper is matched with the torsion spring so that the scraper head of the arc-shaped scraper can extend into meshes of the isolation screen plate, compared with a traditional scraper, the impurity scraping effect is improved, meanwhile, the loss of the arc-shaped scraper is reduced, and energy conservation and environmental protection are achieved by adopting a timed opening scraping mode; and the controller receives a water pressure signal of the water pressure sensor to adjust starting, stopping and the rotating speed of the second motor, the phenomenon that the motor is damaged due to idling is avoided, meanwhile, a good energy-saving effect is achieved, the sewage filtering efficiency is improved through the bottom-to-top filtering mode of sewage in the filtering box, meanwhile, sludge discharging is facilitated, design is reasonable, and the management cost is reduced.

The invention discloses a low-rpm drilling fixture with a safety protection function. The low-rpm drilling fixture with the safety protection function comprises an outer tooth shaft sleeve and an inner tooth shaft sleeve. The outer circumferential surface of the front end of the inner tooth shaft sleeve is connected with an adjusting nut. The front end of the outer tooth shaft sleeve is provided with a chuck. Outer teeth are arranged on the outer circumference of the rear end of the outer tooth shaft sleeve. The outer tooth shaft sleeve is sleeved with inner tooth friction plates. Inner teeth are arranged in the inner tooth shaft sleeve and are sleeved with outer tooth friction plates. The outer tooth friction plates and the inner tooth friction plates are located between a limiting end face of the outer tooth shaft sleeve and a limiting end face of the inner tooth shaft sleeve. When the outer tooth shaft sleeve and the inner tooth shaft sleeve squeeze each other, the outer tooth friction plates and the inner tooth friction plates are axially pressed tightly on the two limiting end faces. Through the structure, the inner tooth shaft sleeve is driven to press tightly or loosen the friction plates through the adjusting nut so that the friction moment between the outer tooth shaft sleeve and the inner tooth shaft sleeve can be increased or decreased, and the low-rpm drilling fixture can play roles in transmitting moment and carrying out overload safety protection. Consequently, current surges are completely avoided, and the phenomenon that a motor or a drill bit is damaged is prevented completely.

The invention provides an external-rotor brushless motor system which comprises an external-rotor brushless motor unit and a driver. The external-rotor brushless motor unit comprises: a center shaft, housing, bearings, a permanent magnet, a stator armature, a rear cover, a fixed plate and a power line which is connected with the stator armature. The driver comprises: an integrated power module, a microprocessor unit, a rotor position sensing circuit, a power supply processing circuit, an input/output interface circuit and a current sensing circuit. When the external-rotor brushless motor provided in the invention is working, the center shaft is immovable and the housing is rotated. Machinery equipment is directly arranged on the housing, and rotation of the machinery equipment is driven by the rotation of the housing. In the prior art, the center shaft is regarded not only as a connection between the machinery equipment but also as an output of moment. The rotation can be affected when the machinery equipment is not concentric or there is an external force so that functions of the motor can be decreased. In the invention, the above situations can be avoided.

The invention relates to a charging gun locking device for charging equipment, which comprises an electronic lock unit and a processing unit used for detecting the start and end of charging, wherein the electronic lock unit comprises a motor. The locking device further comprises a motor forward rotation control circuit used for locking a charging gun and a motor reverse rotation control circuit used for unlocking the charging gun. The processing unit is connected with the motor forward rotation control circuit and the motor reverse rotation control circuit. The charging gun locking device effectively avoids the occurrence of an arcing phenomenon caused by mistakenly pulling the charging gun in the charging process of the charging gun, and ensures the personal safety of the charging personnel.

The invention relates to a bootstrap capacitor charging control device for a permanent-magnet synchronous motor, wherein the bootstrap capacitor charging control device is applied to a direct-currentmotor or a three-phase inverter power supply. The bootstrap capacitor charging control device comprises a direct-current power source and a three-phase bridge arm driving circuit. The three-phase bridge arm driving circuit includes U-phase, V-phase, and W-phase driving circuits connected in parallel and a current sampling circuit. A sampling resistor detects a bus current during the bootstrap capacitor charging process by each phase; a bus current for charging each phase is determined; the bus current for charging each phase is compared with a set current for starting each phase; first switchelements and second switch elements in the driving circuits are controlled to be in conduction one by one according to a U-phase, V-phase, and a W-phase sequence; and thus respective bootstrap capacitors are charged to drive the motor to work. According to the control device, the hardware resources are simplified; the working reliability of the bootstrap capacitor is guaranteed; the normal operation of the motor is ensured; and time wasting during the bootstrap capacitor charging process and motor damages caused by too heavy charging currents are avoided.

The invention provides a robot power joint with a turbulent flow heat dissipation structure and a robot. The power joint comprises a motor, a joint shell and an end packaging part, the motor is installed in a hollow cavity formed by the joint shell, the end packaging part is located at the end of the motor, a first gap is formed between a rotor and a stator, and a first end gap is formed between afirst end of the rotor and the end packaging part; a plurality of axial airflow channels are formed in the middle of the rotor through spacers; a second gap is formed between the circumferential surface of the stator and the joint shell, a second end gap is formed between the first end of the stator and the end packaging part, and the first end of the stator and the first end of the rotor are thesame end of the motor; the axial airflow channels, the first end gap and the first gap form a communicated first air duct; an axial airflow air duct, the second end gap and the second gap form a communicated second air duct; one end, far away from the first end gap, of the joint shell is provided with a heat dissipation flow channel for communicating the first air duct and the second air duct with the outside.